Eureka, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Woodford County, Illinois.
This Afternoon
81°F
Mostly Cloudy
Mostly cloudy, with a high near 81. South wind around 8 mph.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 81°F | Mostly Cloudy | 8 mph S | 14% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 7 mph SSW | 34% |
| Sunday | 75°F | Chance Showers And Thunderstorms | 6 to 14 mph NNE | 50% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 12 to 15 mph NE | 45% |
| Monday | 65°F | Rain Showers Likely | 15 mph ENE | 67% |
| Monday Night | 53°F | Chance Rain Showers | 12 to 15 mph ENE | 54% |
| Tuesday | 64°F | Chance Rain Showers | 14 mph NE | 54% |
| Tuesday Night | 51°F | Slight Chance Rain Showers then Mostly Cloudy | 7 to 14 mph NE | 15% |
| Wednesday | 66°F | Partly Sunny | 8 to 12 mph NNE | 3% |
| Wednesday Night | 52°F | Partly Cloudy | 3 to 10 mph NNE | 2% |
| Thursday | 70°F | Partly Sunny | 7 mph NNE | 2% |
| Thursday Night | 55°F | Mostly Cloudy | 2 to 6 mph NE | 10% |
| Friday | 73°F | Partly Sunny | 3 to 7 mph NE | 7% |
| Friday Night | 54°F | Partly Cloudy | 6 mph NE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (40.714, -89.277). Updated through the day.
Growing snapshot for Eureka
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b
More local growing data for Eureka: nearby ZIP 61530 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Benson
Carlock
Congerville
El Paso
Germantown Hills
Goodfield
Lowpoint
Metamora
Minonk
Panola
Roanoke
Secor
Washburn
Climate data from the nearest NOAA station, Congerville 2Nw, Il (6.2 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.